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java.lang.IllegalArgumentException: URI is not hierarchical	at java.io.File.(File.java:418)	at com.datumbox.framework.common.dataobjects.Dataframe$Builder.parseTextFiles(Dataframe.java:93)	at com.datumbox.framework.applications.nlp.TextClassifier.fit(TextClassifier.java:143)	at com.datumbox.examples.TextClassification.main(TextClassification.java:99)